In a good game, the pros are remembered effortlessly – that’s what makes it a good game, that you don’t have to dig them up.
Well, a huge world is silly. Essentially, it’s a giant sandbox. I don’t see anything good in that.
Regarding quests, you’re being disingenuous – you yourself admitted that there are many stupid and boring ones.
Regarding races, skills, and magic – I won’t argue about that. I really liked them. I don’t think these are the most important things in an RPG (in an RPG, I value the ability to role-play, as I already mentioned), but since Morrowind doesn’t have much else, I’ll give it credit for that.
Regarding quests. I only admitted that there is a stupid linear series of story quests about houses (gaining favor). It’s really awful and sticks in your memory for a long time. The other quests are quite normal.
Well, if you don’t think the character progression system is important for an RPG, then I’m sorry, you don’t understand much about RPGs. I say important because “main” sounds like the only thing. (without any intention of misrepresenting your statements). And quests are not the main thing! Go to literature for quests.
No, it just shows that the number of fans, like the number of mods, doesn’t reflect the “coolness” of the game.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!